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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import sha1 from 'js-sha1'
&nbsp;
function <span class="fstat-no" title="function not covered" >getEtag(</span>buffer, callback) {
  // sha1算法
  var shA1 = <span class="cstat-no" title="statement not covered" >sha1.digest;</span>
&nbsp;
  // 以4M为单位分割
  var blockSize = <span class="cstat-no" title="statement not covered" >4 * 1024 * 1024;</span>
  var sha1String = <span class="cstat-no" title="statement not covered" >[];</span>
  var prefix = <span class="cstat-no" title="statement not covered" >0x16;</span>
  var blockCount = <span class="cstat-no" title="statement not covered" >0;</span>
&nbsp;
  var bufferSize = <span class="cstat-no" title="statement not covered" >buffer.size || buffer.length || buffer.byteLength;</span>
<span class="cstat-no" title="statement not covered" >  blockCount = Math.ceil(bufferSize / blockSize);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  for (var i = <span class="cstat-no" title="statement not covered" >0;</span> i &lt; blockCount; i++) {</span>
<span class="cstat-no" title="statement not covered" >    sha1String.push(shA1(buffer.slice(i * blockSize, (i + 1) * blockSize)));</span>
  }
&nbsp;
  function <span class="fstat-no" title="function not covered" >concatArr2Uint8(</span>s) { //Array 2 Uint8Array
    var tmp = <span class="cstat-no" title="statement not covered" >[];</span>
<span class="cstat-no" title="statement not covered" >    for (var i of s) <span class="cstat-no" title="statement not covered" >tmp = tmp.concat(i);</span></span>
<span class="cstat-no" title="statement not covered" >    return new Uint8Array(tmp);</span>
  }
&nbsp;
  function <span class="fstat-no" title="function not covered" >Uint8ToBase64(</span>u8Arr, urisafe) { //Uint8Array 2 Base64
    var CHUNK_SIZE = <span class="cstat-no" title="statement not covered" >0x8000;</span> //arbitrary number
    var index = <span class="cstat-no" title="statement not covered" >0;</span>
    var length = <span class="cstat-no" title="statement not covered" >u8Arr.length;</span>
    var result = <span class="cstat-no" title="statement not covered" >'';</span>
    var slice;
<span class="cstat-no" title="statement not covered" >    while (index &lt; length) {</span>
<span class="cstat-no" title="statement not covered" >      slice = u8Arr.subarray(index, Math.min(index + CHUNK_SIZE, length));</span>
<span class="cstat-no" title="statement not covered" >      result += String.fromCharCode.apply(null, slice);</span>
<span class="cstat-no" title="statement not covered" >      index += CHUNK_SIZE;</span>
    }
<span class="cstat-no" title="statement not covered" >    return urisafe ? btoa(result).replace(/\//g, '_').replace(/\+/g, '-') : btoa(result);</span>
  }
&nbsp;
  function <span class="fstat-no" title="function not covered" >calcEtag(</span>) {
<span class="cstat-no" title="statement not covered" >    if (!sha1String.length) <span class="cstat-no" title="statement not covered" >return 'Fto5o-5ea0sNMlW_75VgGJCv2AcJ';</span></span>
    var sha1Buffer = <span class="cstat-no" title="statement not covered" >concatArr2Uint8(sha1String);</span>
    // 如果大于4M，则对各个块的sha1结果再次sha1
<span class="cstat-no" title="statement not covered" >    if (blockCount &gt; 1) {</span>
<span class="cstat-no" title="statement not covered" >      prefix = 0x96;</span>
<span class="cstat-no" title="statement not covered" >      sha1Buffer = shA1(sha1Buffer.buffer);</span>
    } else {
<span class="cstat-no" title="statement not covered" >      sha1Buffer = Array.apply([], sha1Buffer);</span>
    }
<span class="cstat-no" title="statement not covered" >    sha1Buffer = concatArr2Uint8([</span>
      [prefix], sha1Buffer
    ]);
<span class="cstat-no" title="statement not covered" >    return Uint8ToBase64(sha1Buffer, true);</span>
  }
<span class="cstat-no" title="statement not covered" >  return (calcEtag());</span>
}
&nbsp;
async function <span class="fstat-no" title="function not covered" >encryptionToString(</span>file) {
<span class="cstat-no" title="statement not covered" >  return new Promise(<span class="fstat-no" title="function not covered" >(r</span>esolve) =&gt; {</span>
    let name
    let reader = <span class="cstat-no" title="statement not covered" >new FileReader()</span>
<span class="cstat-no" title="statement not covered" >    reader.onload = <span class="fstat-no" title="function not covered" >fu</span>nction () {</span>
<span class="cstat-no" title="statement not covered" >      name = getEtag(this.result)</span>
<span class="cstat-no" title="statement not covered" >      resolve(name)</span>
<span class="cstat-no" title="statement not covered" >      return name</span>
    }
<span class="cstat-no" title="statement not covered" >    reader.readAsArrayBuffer(file.raw)</span>
  })
}
&nbsp;
export {
  getEtag,
  encryptionToString
}</pre></td></tr></table></pre>

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